The radius of the circle is 15, so its diameter is 30 that means the distance between P and M, and N and Q, is 30 because those distances are split up into three equal parts by the squares, each square has a length of 10 area of square = side^2 A = 10^2 A = 100 five squares: 100 * 5 500 the shaded area occupies 500 square centimeters